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  <!-- 1.兼容css -->
  <!-- <div class="box">
    我是box
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  <!-- 2.定义变量 -->
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    <p class="pel">我是p元素</p>
    <h1>我是h1元素 <span class="keyword">关键字</span> </h1>
    <p>
      我是一个大的段落
      <a class="link" href="#">百度一下</a>
    </p>
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  <!-- &符号的练习 -->
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    <li class="item">1</li>
    <li class="item">2</li>
    <li class="item">3</li>
    <li class="item">4</li>
    <li class="item">5</li>
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